GM LT1 performance mode

[Big Jack]

Hi guys,
I've got a 1995 Buick Roadmaster wagon that I wired up a momentary push button to engage the transmission's performance mode. One side of button to grey PCM pin 13, other side to ground.*
I also wired an LED to indicate when performance mode is active. - side of LED to red PCM pin 15, + side to +12v source.*
It doesn't seem to work. As soon as ignition key is turned to on position, LED lights up (somewhat dimly) & stays lit, regardless of button is pressed.*
Also there isn't an appreciable difference in shift firmness.
PCM calibration is 16209331
Did I miss something? Do wagon PCMs have this functionality?

[kur4o]

Can you post the bin from your PCM. There are some software switches that might be off in your calibration.

Do you put a resistor between diode and PCM. It is normal to have a faint light comming from the diode. I think it depends from the resistor.

[Big Jack]

BIN atached.
There's a 500 ohm resistor on the + side of the LED

[kur4o]

You need to uncheck byte_2875 $20 and the switch will work.

Is this bin modified or completely stock.

[Big Jack]

As far as I know, it's completely stock

[kur4o]

16206591 - Control Module

16209331

16230261 (Bulletin(s): 576517)

16243171 (Bulletin(s): 576517)
Part Number Cal.ID# CVN Description
16243171 New calibration for vehicles with trailer towing option and unexpected code 77 and chuggle, Bulletin Number

16230261 Corrects chuggle and surge, also corrects intermittent code 32, Bulletin number 576517.

16209331 New calibration to improve driveability, modify 4L60E transmission 3-2 downshift, and refine oil life calibration.

16206591 Control module calibration
Selected Options:
VIN: 1G4BR82P5SR
Controller: PCM/VCM Powertrain/Vehicle Control Module
Function: Programming


You can update to 16243171 cal id if you can find it somewhere.

If you`re having a problem finding the bit, try the xdf here
http://www.gearhead-efi.com/Fuel-Inj...ghlight=eextra

[jthompson122183]

Here's the link to the factory 16243171 bin

http://fbodytech.com/bin/EE_16243171.bin

[Big Jack]

You need to uncheck byte_2875 $20 and the switch will work.

Is this bin modified or completely stock.

I've opened the bin in HxD, it looks like bit 2875 contains "F0". What should it contain if unchecked?
Thanks

[kur4o]

F0 = 1111 0000
D0 = 1101 0000

Change it to D0.
Make sure you update checksums if you edit the bin in Hxd.

You can still download the eextra xdf from the link I gave you and save yourself manual bin editing.

[Big Jack]

F0 = 1111 0000
D0 = 1101 0000

Change it to D0.
Make sure you update checksums if you edit the bin in Hxd.

You can still download the eextra xdf from the link I gave you and save yourself manual bin editing.

I opened bin 16243171 in HxD as well, it also has "F0" at bit 2875.